Organically grown, this unusual looking root vegetable may be used raw or cooked. It has a tough, furrowed, outer surface which is usually sliced off before use because it is too rough to peel. Celeriac has a celery flavour, and is often used as a flavouring in soups and stews. It can also be used on its own, usually mashed, or used in casseroles, gratins and baked dishes.